The Brazilian has struggled to make a breakthrough into Jose Mourinho's starting line-up this season, with Cesar Azpilicueta the club's first-choice in the left-back role.

Luis joined Chelsea for £16m last summer after helping Atletico knock the west Londoners out of the Champions League at the semi-final stage.

INTEREST: Atletico Madrid are eyeing a return for their former left-back [GETTY]

His former Atleti team-mates Diego Costa and Thibaut Courtois have both hit the round running at Stamford Bridge, however, Chelsea were last month forced to deny claims that Luis is fed up with his lack of match action with the Premier League leaders.

And the Telegraph reports today that Atletico are monitoring the situation with a view to bringing the player back to Spain in the summer.

Luis has made just six starts in the top flight this season, along with a further 11 in the FA Cup, Capital One Cup and Champions League.